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Note 20 - Revision of Previously Issued Consolidated Financial Statements - Summary of Significant Revisions (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2020 | Apr. 30, 2020 | Dec. 31, 2019 | Apr. 30, 2019 | May 01, 2018 | Apr. 30, 2018
Securities available-for-sale |  |  |  |  |  |  |
Equity securities | $ 23,582,000 | 14,125,000 | $ 14,125,000 | 10,622,000 |  |  |
Available-for-sale Fixed Income securities | 2,600,000 | 15,079,000 | 15,079,000 | 11,206,000 |  |  |
Retained earnings | 72,502,000 | 57,374,000 | 57,374,000 | 50,242,000 |  |  |
Accumulated other comprehensive income, net of tax | 3,000 | 131,000 | 131,000 | 34,000 |  |  |
Total shareholders' equity | 67,013,000 | 53,539,000 | 53,539,000 | 47,524,000 | $ 47,524,000 |  | $ 43,541,000
Investment gains/(losses) | 5,420,000 | (789,000) | (789,000) | 1,591,000 | 1,591,000 |  |
Income before income taxes | 30,276,000 | 20,651,000 | 20,651,000 | 16,313,000 | 16,313,000 |  |
Income tax provision | 6,996,000 | 5,708,000 | 5,708,000 | 4,304,000 | 4,304,000 |  |
Net income | $ 23,280,000 | $ 14,943,000 | $ 14,943,000 | $ 12,009,000 | $ 12,009,000 |  |
Earnings per share, basic & fully diluted (in dollars per share) | $ 2.43 | $ 1.55 | $ 1.55 | $ 1.24 | $ 1.24 |  |
Change in unrealized gains on Fixed Income securities, net of taxes | $ (128,000) | $ 97,000 | $ 97,000 | $ 36,000 | $ 36,000 |  |
Other comprehensive income/(loss) | (128,000) | 97,000 | 97,000 | 36,000 | 36,000 |  |
Comprehensive income | 23,152,000 | 15,040,000 | 15,040,000 | 12,045,000 | 12,045,000 |  |
Investment (gains)/losses | 4,710,000 | 1,414,000 | (1,414,000) | (1,087,000) | 1,087,000 |  |
Deferred income taxes | 543,000 | 154,000 | 154,000 | 740,000 | 740,000 |  |
Total adjustments | (6,870,000) | (1,198,000) | (1,198,000) | (515,000) | (515,000) |  |
Net cash provided by operating activities | $ 16,410,000 | 13,745,000 | $ 13,745,000 | 11,494,000 | $ 11,494,000 |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Total shareholders' equity |  |  |  |  |  |  |
Accounting Standards Update 2016-01 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Total shareholders' equity |  |  |  |  |  | $ 0 |
Previously Reported [Member] |  |  |  |  |  |  |
Securities available-for-sale |  | 29,204,000 |  | 21,828,000 |  |  |
Equity securities |  |  |  |  |  |  |
Available-for-sale Fixed Income securities |  |  |  |  |  |  |
Retained earnings |  | 56,450,000 |  | 48,598,000 |  |  |
Accumulated other comprehensive income, net of tax |  | 1,055,000 |  | 1,678,000 |  |  |
Total shareholders' equity |  | 53,539,000 |  | 47,524,000 |  |  |
Investment gains/(losses) |  | 44,000 |  | 504,000 |  |  |
Income before income taxes |  | 21,484,000 |  | 15,226,000 |  |  |
Income tax provision |  | 5,821,000 |  | 4,076,000 |  |  |
Net income |  | $ 15,663,000 |  | $ 11,150,000 |  |  |
Earnings per share, basic & fully diluted (in dollars per share) |  | $ 1.62 |  | $ 1.15 |  |  |
Change in unrealized gains on Fixed Income securities, net of taxes |  | $ (623,000) |  | $ 895,000 |  |  |
Other comprehensive income/(loss) |  | (623,000) |  | 895,000 |  |  |
Comprehensive income |  | 15,040,000 |  | 12,045,000 |  |  |
Investment (gains)/losses |  | 581,000 |  |  |  |  |
Deferred income taxes |  | 267,000 |  | 512,000 |  |  |
Total adjustments |  | (1,918,000) |  | 344,000 |  |  |
Net cash provided by operating activities |  | 13,745,000 |  | 11,494,000 |  |  |
Previously Reported [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Total shareholders' equity |  |  |  |  |  |  |
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |
Securities available-for-sale |  | (29,204,000) |  | (21,828,000) |  |  |
Equity securities |  | 14,125,000 |  | 10,622,000 |  |  |
Available-for-sale Fixed Income securities |  | 15,079,000 |  | 11,206,000 |  |  |
Retained earnings |  | 924,000 |  | 1,644,000 |  |  |
Accumulated other comprehensive income, net of tax |  | (924,000) |  | (1,644,000) |  |  |
Total shareholders' equity |  |  |  |  |  |  |
Investment gains/(losses) |  | (833,000) |  | 1,087,000 |  |  |
Income before income taxes |  | (833,000) |  | 1,087,000 |  |  |
Income tax provision |  | (113,000) |  | 228,000 |  |  |
Net income |  | $ (720,000) |  | $ 859,000 |  |  |
Earnings per share, basic & fully diluted (in dollars per share) |  | $ (0.07) |  | $ 0.09 |  |  |
Change in unrealized gains on Fixed Income securities, net of taxes |  | $ 720,000 |  | $ (859,000) |  |  |
Other comprehensive income/(loss) |  | 720,000 |  | (859,000) |  |  |
Comprehensive income |  |  |  |  |  |  |
Investment (gains)/losses |  | 833,000 |  | (1,087,000) |  |  |
Deferred income taxes |  | (113,000) |  | 228,000 |  |  |
Total adjustments |  | 720,000 |  | (859,000) |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |
Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Accounting Standards Update 2016-01 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Total shareholders' equity |  |  |  |  |  |  |

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